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@uiten faire atat @ffice ELI J. MANVILLE, OF WATERBURY, CONNECTICUT,ASSIGNORTO TURNER SEYMOUR di JUDDS, OF WOLCOTTVILLE, CONNECTICUT.

Leners Para@ No. 63,275, dated Mai-@1t 2c, 1867.

IMPROVEMENT IN METAL CASES FOR SPRING BOLTS.

TO ALL WHOM IT MAY OONCERN:

Be it known that I, ELI J. MANVILLE, of Waterbury, in the county of NewHaven, and State of Connecticut, have invented, made, and applied to usea certain new and useful Improvement in Machinery for Making Sheet-Metal Cases for Spring Bolts, ne.; and I do hereby declare the followingto be a full, clear, and exact description of the said invention,reference being'had to the annexed drawing, making part of thisspecification, wherein- Figure I is a perspective view of thesheet-metal case that this machine is designed for manufacturing.

Figure 2 is a plan of'the machine complete.

Figure 3'is a section through the forming dies at the line x x; and

Figure 4 is a cross-section at the line y y.

Similar marks of reference denote the same parts. i

The object of my invention is to bend up sheet'inetal into the form of acylindrical case, with a flange at one end turned outwards, and a fiangeat the other end turned inwards. These cases are employed for receivingthe spring and its bolt that are used in window-sashes for sustainingthe same at any point where a cavity may be formed in the window-casing,but these sheet-metal cases may be employed wherever available.

In luy-machine the following movements are performed, which I state intheir order, and then give the means for effecting thosemotio-ns: l

First, a piece of sheet metal is bent up into a U form between themandrel a and a half-round die, b, by said mandrel a being pressedsidewise down upon the piece of sheet metal.

Second, the sheet metal is closed around the mandrel by a die, c, comingdown upon the edges of said sheet.

Third, a die, d, is slidden up against the end ofthe cylinder of sheetmetal, and turns a fla-nge outward around the end.

Fourth. Simultaneously a die, e, comes up against the other end of thesheet-metal cylinder and-gathers it inwardly; and,

Fifth, at the same time the mandrel a has an cndwise movement given toit to smoothand complete the formation of the inwardly-turned flangebetween. theend of the mandrel a and the die e. The die c and mandrel arise to their irst position ready to receive and actl upon another pieceof sheet metal; but previously, and by the Sixth movement, the finishedcase is projected off the mandrel by an end motion given to the die d.

fis the main shaft, revolved by competent power in the direction of thearrow. g y are slings, carrying at their ends the die c, beneath whichis a spring, i, to keep the die c up, except when pressed down by thecam h', that acts upon the lever lc, having its fulcrum at k in astandard upon the bed lof the machine, which also supports the die b andother parts of the machine.

The first movement aforesaid is eifected by the lever m, that has 'aneye yat its end, through which passes the die d. This lever m is actedupon by a cam, m, and spring, 1.

. The third movement aforesaid is effected by the lever n on a fulerum,2, acted upon by a side cam to the disk nl', to give to the stock o ofthe die CZ and mandrel a a slight, powerful end motion, to turn the angeoutwardly on the sheet metal. The stock o is supported in a box, o. Andsaid stock o is hollow, and the mandrel a at its inner end is hingedtherein, as at 3, by a ball or joint. And the mandrel has aroundit,within this stock o, a spring, 4, to give to the die d the sixthmovement before mentioned, when the mandrel has been raised by the leverfm, the die ci being drawn back against said spring by the camp actingon the lever p1, and link pz to the arm 5, from the die d, the cam inbeing shaped so as to allow of the pin at the end of the'lever p1 beingrelieved to allow the spring 4 to act.V The die CZ and mandrel a aremoved endwise simultaneously by the lever n` and its cam n, effectingthe third and fifth movements aforesaid.

The fourth movement is eifected by a lever, q, on a fulcrum, 6, actedupon by a cam projection on the side of the disk q', the other end ofthe leverfpressing against the outer end of the die e. 'Ihis die c issupported in a stock, e', and is drawn back by the spring 7`as thepressure o f thelever q is released.

That I claim, and desire to secure by Letters Patent, is-

The combination of the mandrel a and dies b, chal, and e, to whichmovements' are communicated, in substantially the manner specified, forbending up a sheet-mctal case with flancos at its ends, as set forth.

In witness whereof I have hereunto'setmy signature this fifth day ofSeptember, A. D. 1866.

ELI J, MANVILLE.

Vitnesses:

W. H. LACY, Jr., F. I. SEYMOUR..

